X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Fcpu%2Fattr.h;h=832f0618698c724945f7196dfaf97e30cf790404;hb=32d1445272120a254d77ce8d1af1f527da7a2c17;hp=13955b33b0629ad086e5106fe72bb84bbe02a419;hpb=8e42706c97a8fab77f8303ade092105ab2d24b82;p=bertos.git diff --git a/bertos/cpu/attr.h b/bertos/cpu/attr.h index 13955b33..832f0618 100644 --- a/bertos/cpu/attr.h +++ b/bertos/cpu/attr.h @@ -26,15 +26,14 @@ * invalidate any other reasons why the executable file might be covered by * the GNU General Public License. * - * Copyright 2004, 2005, 2006, 2007 Develer S.r.l. (http://www.develer.com/) + * Copyright 2004, 2005, 2006, 2007, 2008 Develer S.r.l. (http://www.develer.com/) * Copyright 2004 Giovanni Bajo - * * --> * * \brief CPU-specific attributes. * * \author Giovanni Bajo - * \author Bernardo Innocenti + * \author Bernie Innocenti * \author Stefano Fedrigo * \author Francesco Sacchi */ @@ -43,9 +42,8 @@ #include "detect.h" +#include "cfg/cfg_proc.h" /* CONFIG_KERN_PREEMPT */ #include "cfg/cfg_attr.h" /* CONFIG_FAST_MEM */ -#include "cfg/cfg_arch.h" /* ARCH_EMUL */ -#include /* for uintXX_t */ /** @@ -69,21 +67,17 @@ #define CPU_REG_BITS 16 #define CPU_REGS_CNT 16 - #define CPU_STACK_GROWS_UPWARD 0 - #define CPU_SP_ON_EMPTY_SLOT 0 #define CPU_BYTE_ORDER CPU_LITTLE_ENDIAN - #define CPU_HARVARD 0 + #define CPU_HARVARD 0 -#elif CPU_X86 + /// Valid pointers should be >= than this value (used for debug) + #define CPU_RAM_START 0x100 - #define NOP asm volatile ("nop") +#elif CPU_X86 #define CPU_REGS_CNT 7 - #define CPU_SAVED_REGS_CNT 7 - #define CPU_STACK_GROWS_UPWARD 0 - #define CPU_SP_ON_EMPTY_SLOT 0 #define CPU_BYTE_ORDER CPU_LITTLE_ENDIAN - #define CPU_HARVARD 0 + #define CPU_HARVARD 0 #if CPU_X86_64 #define CPU_REG_BITS 64 @@ -96,16 +90,30 @@ #define CPU_REG_BITS 32 #endif + /// Valid pointers should be >= than this value (used for debug) + #define CPU_RAM_START 0x1000 + + #ifdef __GNUC__ + #define NOP asm volatile ("nop") + /* This is a good thing to insert into busy-wait loops. */ + #define PAUSE asm volatile ("rep; nop" ::: "memory") + #define BREAKPOINT asm volatile ("int3" ::) + #endif + #elif CPU_ARM - /* Register counts include SREG too */ #define CPU_REG_BITS 32 #define CPU_REGS_CNT 16 - #define CPU_SAVED_REGS_CNT 9 - #define CPU_STACK_GROWS_UPWARD 0 - #define CPU_SP_ON_EMPTY_SLOT 0 #define CPU_HARVARD 0 + /// Valid pointers should be >= than this value (used for debug) + #if CPU_ARM_AT91 + #define CPU_RAM_START 0x00200000 + #else + #warning Fix CPU_RAM_START address for your ARM, default value set to 0x200 + #define CPU_RAM_START 0x200 + #endif + #ifdef __IAR_SYSTEMS_ICC__ #warning Check CPU_BYTE_ORDER #define CPU_BYTE_ORDER (__BIG_ENDIAN__ ? CPU_BIG_ENDIAN : CPU_LITTLE_ENDIAN) @@ -115,28 +123,15 @@ #else /* GCC and compatibles */ #if defined(__ARMEB__) - #define CPU_BYTE_ORDER CPU_BIG_ENDIAN - #elif defined(__ARMEL__) - #define CPU_BYTE_ORDER CPU_LITTLE_ENDIAN + #define CPU_BYTE_ORDER CPU_BIG_ENDIAN + #elif defined(__ARMEL__) + #define CPU_BYTE_ORDER CPU_LITTLE_ENDIAN #else #error Unable to detect ARM endianness! #endif #define NOP asm volatile ("mov r0,r0" ::) - - /** - * Initialization value for registers in stack frame. - * The register index is not directly corrispondent to CPU - * register numbers, but is related to how are pushed to - * stack (\see asm_switch_context). - * Index (CPU_SAVED_REGS_CNT - 1) is the CPSR register, - * the initial value is set to: - * - All flags (N, Z, C, V) set to 0. - * - IRQ and FIQ enabled. - * - ARM state. - * - CPU in Supervisor Mode (SVC). - */ - #define CPU_REG_INIT_VALUE(reg) (reg == (CPU_SAVED_REGS_CNT - 1) ? 0x13 : 0) + #define BREAKPOINT /* asm("bkpt 0") DOES NOT WORK */ #if CONFIG_FAST_MEM /** @@ -161,34 +156,32 @@ #define FAST_FUNC /**/ #endif - /** - * Function attribute to declare an interrupt service routine. + /* + * Function attribute to move it into ram memory. */ - #define ISR_FUNC __attribute__((interrupt)) + #define RAM_FUNC __attribute__((section(".data"))) #endif /* !__IAR_SYSTEMS_ICC_ */ #elif CPU_PPC - #define NOP asm volatile ("nop" ::) - /* Register counts include SREG too */ #define CPU_REG_BITS (CPU_PPC32 ? 32 : 64) #define CPU_REGS_CNT FIXME - #define CPU_SAVED_REGS_CNT FIXME - #define CPU_STACK_GROWS_UPWARD 0 //FIXME - #define CPU_SP_ON_EMPTY_SLOT 0 //FIXME #define CPU_BYTE_ORDER (__BIG_ENDIAN__ ? CPU_BIG_ENDIAN : CPU_LITTLE_ENDIAN) #define CPU_HARVARD 0 -#elif CPU_DSP56K + /// Valid pointers should be >= than this value (used for debug) + #define CPU_RAM_START 0x1000 - #define NOP asm(nop) + #ifdef __GNUC__ + #define NOP asm volatile ("nop" ::) + #define BREAKPOINT asm volatile ("twge 2,2" ::) + #endif + +#elif CPU_DSP56K #define CPU_REG_BITS 16 #define CPU_REGS_CNT FIXME - #define CPU_SAVED_REGS_CNT 8 - #define CPU_STACK_GROWS_UPWARD 1 - #define CPU_SP_ON_EMPTY_SLOT 0 #define CPU_BYTE_ORDER CPU_BIG_ENDIAN #define CPU_HARVARD 1 @@ -199,166 +192,54 @@ #define SIZEOF_LONG 2 #define SIZEOF_PTR 1 + /// Valid pointers should be >= than this value (used for debug) + #define CPU_RAM_START 0x200 + + #define NOP asm(nop) + #define BREAKPOINT asm(debug) + #elif CPU_AVR - #define NOP asm volatile ("nop" ::) + #define NOP asm volatile ("nop" ::) - /* Register counts include SREG too */ #define CPU_REG_BITS 8 - #define CPU_REGS_CNT 33 - #define CPU_SAVED_REGS_CNT 19 - #define CPU_STACK_GROWS_UPWARD 0 - #define CPU_SP_ON_EMPTY_SLOT 1 + #define CPU_REGS_CNT 33 /* Includes SREG */ #define CPU_BYTE_ORDER CPU_LITTLE_ENDIAN #define CPU_HARVARD 1 - /** - * Initialization value for registers in stack frame. - * The register index is not directly corrispondent to CPU - * register numbers. Index 0 is the SREG register: the initial - * value is all 0 but the interrupt bit (bit 7). - */ - #define CPU_REG_INIT_VALUE(reg) (reg == 0 ? 0x80 : 0) + /// Valid pointers should be >= than this value (used for debug) + #if CPU_AVR_ATMEGA8 || CPU_AVR_ATMEGA32 || CPU_AVR_ATMEGA103 + #define CPU_RAM_START 0x60 + #elif CPU_AVR_ATMEGA64 || CPU_AVR_ATMEGA128 || CPU_AVR_ATMEGA168 + #define CPU_RAM_START 0x100 + #elif CPU_AVR_ATMEGA1281 + #define CPU_RAM_START 0x200 + #else + #warning Fix CPU_RAM_START address for your AVR, default value set to 0x100 + #define CPU_RAM_START 0x100 + #endif #else #error No CPU_... defined. #endif -/// Default for macro not defined in the right arch section -#ifndef CPU_REG_INIT_VALUE - #define CPU_REG_INIT_VALUE(reg) 0 -#endif - -#ifndef CPU_STACK_GROWS_UPWARD - #error CPU_STACK_GROWS_UPWARD should have been defined to either 0 or 1 -#endif - -#ifndef CPU_SP_ON_EMPTY_SLOT - #error CPU_SP_ON_EMPTY_SLOT should have been defined to either 0 or 1 +#ifndef BREAKPOINT +#define BREAKPOINT /* nop */ #endif #ifndef FAST_FUNC - /** - * Function attribute for use with performance critical code. - */ + /// Function attribute for use with performance critical code. #define FAST_FUNC /* */ #endif #ifndef FAST_RODATA - /** - * Data attribute to move constant data to fast memory storage. - */ + /// Data attribute to move constant data to fast memory storage. #define FAST_RODATA /* */ #endif -/* - * Support stack handling peculiarities of a few CPUs. - * - * Most processors let their stack grow downward and - * keep SP pointing at the last pushed value. - */ -#if !CPU_STACK_GROWS_UPWARD - #if !CPU_SP_ON_EMPTY_SLOT - /* Most microprocessors (x86, m68k...) */ - #define CPU_PUSH_WORD(sp, data) \ - do { *--(sp) = (data); } while (0) - #define CPU_POP_WORD(sp) \ - (*(sp)++) - #else - /* AVR insanity */ - #define CPU_PUSH_WORD(sp, data) \ - do { *(sp)-- = (data); } while (0) - #define CPU_POP_WORD(sp) \ - (*++(sp)) - #endif - -#else /* CPU_STACK_GROWS_UPWARD */ - - #if !CPU_SP_ON_EMPTY_SLOT - /* DSP56K and other weirdos */ - #define CPU_PUSH_WORD(sp, data) \ - do { *++(sp) = (cpustack_t)(data); } while (0) - #define CPU_POP_WORD(sp) \ - (*(sp)--) - #else - #error I bet you cannot find a CPU like this - #endif -#endif - - -#if CPU_DSP56K - /* - * DSP56k pushes both PC and SR to the stack in the JSR instruction, but - * RTS discards SR while returning (it does not restore it). So we push - * 0 to fake the same context. - */ - #define CPU_PUSH_CALL_CONTEXT(sp, func) \ - do { \ - CPU_PUSH_WORD((sp), (func)); \ - CPU_PUSH_WORD((sp), 0x100); \ - } while (0); - -#elif CPU_AVR - /* - * In AVR, the addresses are pushed into the stack as little-endian, while - * memory accesses are big-endian (actually, it's a 8-bit CPU, so there is - * no natural endianess). - */ - #define CPU_PUSH_CALL_CONTEXT(sp, func) \ - do { \ - uint16_t funcaddr = (uint16_t)(func); \ - CPU_PUSH_WORD((sp), funcaddr); \ - CPU_PUSH_WORD((sp), funcaddr>>8); \ - } while (0) - - /* - * If the kernel is in idle-spinning, the processor executes: - * - * IRQ_ENABLE; - * CPU_IDLE; - * IRQ_DISABLE; - * - * IRQ_ENABLE is translated in asm as "sei" and IRQ_DISABLE as "cli". - * We could define CPU_IDLE to expand to none, so the resulting - * asm code would be: - * - * sei; - * cli; - * - * But Atmel datasheet states: - * "When using the SEI instruction to enable interrupts, - * the instruction following SEI will be executed *before* - * any pending interrupts", so "cli" is executed before any - * pending interrupt with the result that IRQs will *NOT* - * be enabled! - * To ensure that IRQ will run a NOP is required. - */ - #define CPU_IDLE NOP - -#else - #define CPU_PUSH_CALL_CONTEXT(sp, func) \ - CPU_PUSH_WORD((sp), (cpustack_t)(func)) +#ifndef PAUSE + /// Generic PAUSE implementation. + #define PAUSE {NOP; MEMORY_BARRIER;} #endif -/** - * \def CPU_IDLE - * - * \brief Invoked by the scheduler to stop the CPU when idle. - * - * This hook can be redefined to put the CPU in low-power mode, or to - * profile system load with an external strobe, or to save CPU cycles - * in hosted environments such as emulators. - */ -#ifndef CPU_IDLE - #if defined(ARCH_EMUL) && (ARCH & ARCH_EMUL) - /* This emulator hook should yield the CPU to the host. */ - EXTERN_C_BEGIN - void emul_idle(void); - EXTERN_C_END - #define CPU_IDLE emul_idle() - #else /* !ARCH_EMUL */ - #define CPU_IDLE do { /* nothing */ } while (0) - #endif /* !ARCH_EMUL */ -#endif /* !CPU_IDLE */ - #endif /* CPU_ATTR_H */